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Don't do any calculations when thay are not needed

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This commit is contained in:
ehofman
2004-01-15 14:22:03 +00:00
parent 36521869ae
commit 5665a62938
1 changed files with 24 additions and 11 deletions
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35
simgear/screen/colors.hxx
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@@ -36,33 +36,46 @@ const float system_gamma = 1.7;
const float system_gamma = 2.5;
#endif
// simple architecture independant gamma correction function.
inline void gamma_correct_rgb(float *color,
float reff = 2.5, float system = system_gamma)
float reff = 2.5, float system = system_gamma)
{
color[0] = pow(color[0], reff/system);
color[1] = pow(color[1], reff/system);
color[2] = pow(color[2], reff/system);
if (reff == system)
return;
float tmp = reff/system;
color[0] = pow(color[0], tmp);
color[1] = pow(color[1], tmp);
color[2] = pow(color[2], tmp);
};
inline void gamma_correct_c(float *color,
float reff = 2.5, float system = system_gamma)
float reff = 2.5, float system = system_gamma)
{
if (reff == system)
return;
*color = pow(*color, reff/system);
};
inline void gamma_restore_rgb(float *color,
float reff = 2.5, float system = system_gamma)
float reff = 2.5, float system = system_gamma)
{
color[0] = pow(color[0], system/reff);
color[1] = pow(color[1], system/reff);
color[2] = pow(color[2], system/reff);
if (reff == system)
return;
float tmp = system/reff;
color[0] = pow(color[0], tmp);
color[1] = pow(color[1], tmp);
color[2] = pow(color[2], tmp);
};
inline void gamma_restore_c(float *color,
float reff = 2.5, float system = system_gamma)
float reff = 2.5, float system = system_gamma)
{
if (reff == system)
return;
*color = pow(*color, system/reff);
};